Wonderful photo,all components of the image combine to make this a great photo,greatsmlie ,sharpness of fore ground ,a background to die for and yes the chasing mom? really adds to oberall image,although I think dp is right the boy alone would also have been super.

'There is no point pressing the shutter unless you are making some caustic comment on the incongruities of life. That is what photography is all about. It is the only reason for doing it.'......Philip Jones Griffiths

To take an opposing view, keeping mum in makes it a story about a tired adult struggling to keep up with an active child. They've clearly been on the go all day, but she's about done in and he's still full of beans - I can sympathise (and mine isn't even walking yet)! Perhaps a bit more blur on mum in the background would have separated the subject planes better.